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Description of problem:
Helper modules for services that are enabled in the default zone before starting firewalld are loaded, but not for services that are enabled in an active while firewalld is running.

This happened because for these zones the FirewallZoneTransaction is used directly and because of this the added modules are simply not used.

Version-Release number of selected component (if applicable):
firewalld-0.4.3.2-5

How reproducible:
Always

Steps to Reproduce:
1. Make sure that the tftp helper is not loaded (lsmod | grep nf_conntrack_tftp)
2. Enable the tftp service in an active zone

Actual results:
No tftp helper loaded: lsmod | grep nf_conntrack_tftp is empty

Expected results:
# lsmod | grep nf_conntrack_tftp
nf_conntrack_tftp      16384  0

Additional info:

Fixed upstream: 
https://github.com/t-woerner/firewalld/commit/42faa017bdf89ea4d050ee7a5d5a283cd28e6e8c

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2016-2597.html